تقرير
A statistical formalism for alignment analysis
| العنوان: | A statistical formalism for alignment analysis |
|---|---|
| المؤلفون: | Dávila-Kurbán, F., Lares, M., Lambas, D. Garcia |
| سنة النشر: | 2022 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Astrophysics of Galaxies |
| الوصف: | The detection of anisotropies with respect to a given direction in a vector field is a common problem in astronomy. Several methods have been proposed that rely on the distribution of the acute angles between the data and a reference direction. Different approaches use Monte Carlo methods to quantify the statistical significance of a signal, although often lacking an analytical framework. Here we present two methods to detect and quantify alignment signals and test their statistical robustness. The first method considers the deviance of the relative fraction of vector components in the plane perpendicular to a reference direction with respect to an isotropic distribution. We also derive the statistical properties and stability of the resulting estimator, and therefore does not rely on Monte Carlo simulations to assess its statistical significance. The second method is based on a fit over the residuals of the empirical cumulative distribution function with respect to that expected for a uniform distribution, using a small set of harmonic orthogonal functions, which does not rely on any binning scheme. We compare these methods with others commonly used in the literature, using Monte Carlo simulations, finding that the proposed statistics allow the detection of alignment signals with greater significance. Comment: 15 pages, 7 figures, submitted to MNRAS. Submitted simultaneously with a paper by the same author that applies the methods presented herein in a simulation |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2202.13244 |
| رقم الأكسشن: | edsarx.2202.13244 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |